Material flow during friction hydro-pillar processing

Landell, Renan Mensch; Kanan, Luis Fernando; Buzzatti, Diogo Trento; Vicharapu, Buchibabu; De, A.; Clarke, Thomas Gabriel Rosauro

doi:10.1080/13621718.2019.1679963

Cited by 17 publications

(17 citation statements)

References 20 publications

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“…The higher temperature isotherms, orange and red contours, tend to concentrate towards the pipe-girth interface and remain around 0.91 ∼ 0.95 times the solidus temperature (T S ) of the base material (Table 2). Landell et al [18] also reported similar range of peak temperatures in friction based joining of steels and other structural materials. A comparison of (Figs.…”

Section: Temperature Distribution and Thermal Cyclesmentioning

confidence: 71%

“…The same also complies with the hypothesis that no heat generation due to frictional work would occur when the material is adequately softened or melted [20]. Such a friction law has widely been used for modeling of several variants of friction welding processes including rotary friction welding (RFW) [15,16,21], friction stir welding (FSW) [20] and friction hydropillar processing (FHPP) [18]. The values of η h and μ were considered as 0.5 and 0.3, respectively.…”

Section: Theoretical Formulationmentioning

confidence: 79%

“…Each node of the CGAX4HT consists of temperature, displacement and twist degrees of freedom. Landell et al [18] also employed a similar methodology for a prior estimation of the weld joint shape and material flow to simulate FHPP of AISI 4140 steel. D'Alvise et al [17] utilized similar elements for a fully coupled temperature-displacement analysis of inertia friction welding to estimate flash formation, and weld joint size and shape.…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…where h b = 10.0 W m −2 K −1 . The peak temperature during solid state joining remains below the solidus temperature of the respective workpiece material [15][16][17][18][19][20][21][22][23][24]. Similar boundary conditions are used in numerical heat transfer modeling of FSW and stationary shoulder friction stir welding (SSFSW) processes [23,24].…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…D'Alvise et al [17] computed the flash foramtion in inertial friction welding using a finite element method based process simulation model. Landell et al [18] and Kanan et al [19] developed process simulation models to explain the material flow and defect formation in FHPP of steels. Similar process models are yet scarce in open literature for GFW and RFW processes.…”

Section: Introductionmentioning

confidence: 99%

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An investigation on girth friction welding of duplex stainless steel pipes

Kanan

Vicharapu

Pissanti

et al. 2020

Journal of Manufacturing Processes

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Girth friction welding is a novel technique to join co-axial linepipes with an external ring (girth) in solid state and without melting of materials. The ring or the girth is rotated between two pipes under an axial force resulting in frictional heat generation and plastic deformation along the pipe-girth interfaces. The rotation of the girth is stopped after a preset displacement of the pipes while the force is maintained to consolidate the deformed material and form the joint along the girth-pipe interfaces. Since the girth is only rotated and the pipeline sections remain stationary, the process simplifies the in situ assembly operations and enables the joining of complex configurations. As the melting of pipes and girth is avoided, the formation of harmful intermetallic compounds and deterioration of toughness in the heat affected zone are minimized. A comprehensive numerical model is reported in the present work to analyse the influence of key process variables on the rate of heat generation, resulting temperature field and thermal cycles, and the nature of material flow along the pipe-girth interfaces in girth friction welding of duplex stainless steel pipes. The computed results of thermal cycles and joint shapes are validated with the corresponding experimentally measured results. The results showed a favorable balance of the ferrite and austenite phases, and very little presence of the harmful sigma phases in the recrystallized weld-zone, which is difficult in fusion welding processes of similar materials.

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Section: Temperature Distribution and Thermal Cyclesmentioning

confidence: 71%